Objectives:
* Make it possible to add items to toolbars without having to have all
toolbars know about the items in advance
* Make it possible to specialize an existing tool and have it be used
instead of the base implementation
Approach:
* Tools are named using a path-style category/id/ext system, making them
selectable, the latter component being used to differentiate extended
tools from their base classes, but is ignored during selection
* Toolbars have ToolGroups, which include or exclude tools by category or
category/id, and order them by promoting and demoting selections of
tools by category or category/id
Future:
* Add a way to place available but not yet placed tools in an "overflow"
group
* Add a mode to ToolGroup to make the tools a multi-column drop-down style
list with labels so tools with less obvious icons are easier to identify
- and probably use this as the overflow group
Change-Id: I7625f861435a99ce3d7a2b1ece9731aaab1776f8
VisualEditor.i18n.php, VisualEditor.php
* Button title
* New experimental files
ve.*.MWAlienExtensionNode.js
* Very basic extension of ve.*.MWExtensionNode
ve.ui.MWAlienExtensionInspector.js
* Default to inline-block for wrapper. Should probably
get rid of styled wrappers for GeneratedContent eventually.
ve.ui.MWAlienExtensionInspector.js
* Basic extension of MWExtensionInspector. Override title to
use tag name e.g. '<easytimeline>'. Could be changed in future
to 'Extension: easytimeline' or similar.
*.png, *.svg, *Icons*.css, ve.ui.MWAlienExtensionButtonTool.js
* Angle bracket icon for button (open to suggestions)
ve.ui.MWInspector.css
* Make extension inspector text input tall by default.
Change-Id: I07f0686839192cad3cd8dfd3233ae907fe5cdf6a
